rear axle width help needed
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Starting Member
Joined: Aug 2007
Posts: 124
From: Atlanta, Ga.
rear axle width help needed
i want to put a zr2 rear axle in my 03 blazer...to get the rear the same width as the front...was told i can not do this unless the axles are the same ratio...can anyone chime in....and what years im looking for?
Moderator
Joined: Apr 2013
Posts: 878
From: NY
98+ zr2 should work as long as it's the same ratio.
I would recommend finding one that has a gov-loc style locker (g80 rpo)
RPO codes for gear ratio identification:
GU4=3.08
GU5=3.23
GU6=3.42
GT4=3.73
GT5=4.10
HC4=4.56
I would recommend finding one that has a gov-loc style locker (g80 rpo)
RPO codes for gear ratio identification:
GU4=3.08
GU5=3.23
GU6=3.42
GT4=3.73
GT5=4.10
HC4=4.56
BF Veteran
Joined: Jan 2008
Posts: 2,750
From: Southern, Alberta
Standard OEM gears in a ZR2 are 3.73 (GT4). The most common in non-ZR2 Blazers are 3.42 and 3.73, and you can find your OEM equipment on the RPO list sticker in your glovebox. Just find the code on your sticker that matches the list posted by Chevyriders. If you have different gears in your truck than the donor ZR2 axle, the easiest & cheapest is to just swap your front diff as well.
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